NDLI: Self-controlled PTC sensor for reliable overfill protection of liquids

Content Provider	IEEE Xplore Digital Library
Author	Horn, M. Umar, L. Ruser, H.
Copyright Year	2001
Description	Author affiliation: Inst. of Meas. & Autom., Univ. der Bundeswehr Munchen, Neubiberg, Germany (Horn, M.; Umar, L.; Ruser, H.)
Abstract	The paper deals with the design of sensors with automatic self-control. A PTC thermistor was selected, which is used as a level sensor to prevent overfill of liquids in tanks. In self-heated mode, the I-U characteristic is basically dependent on the unloading resistance value R/sub T/ of the PTC sensor itself, the thermal resistance R/sub W/ and the temperature T/sub M/ of the medium that is surrounding it. This I-U characteristic of the sensor in thermally steady state in still air is modelled. Problems in detecting the liquid level occur for a soiled sensor surface or liquids with high temperature and/or high viscosity (e.g. crude oil). A solution to this worst-case scenario is to determine R/sub W/ continuously from the I-U characteristic of the PTC thermistor in function. The constant monitoring of the sensor parameters enables an automatic sensor self control, e.g. to identify slow changes of the sensor parameters due to corrosion and dust layers on the sensor surface or ageing.
Sponsorship	IEEE Instrum. Measurement Soc
Starting Page	415
Ending Page	419
File Size	373198
Page Count	5
File Format	PDF
ISBN	0780372182
ISSN	10915281
DOI	10.1109/IMTC.2002.1006877
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-05-21
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Protection Sensor phenomena and characterization Temperature sensors Liquids Thermal resistance Thermistors Thermal sensors Level control Temperature dependence Steady-state
Content Type	Text
Resource Type	Article
Subject	Instrumentation Electrical and Electronic Engineering

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